E7H16 (C)
What is a phase-locked loop circuit?
A. An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator
B. An electronic circuit also known as a monostable multivibrator
C. An electronic servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator
D. An electronic circuit consisting of a precision push-pull amplifier with a differential input
